//
//  AppUtil.m
//  TestGzip
//
//  Created by TORNEY_ZHANG on 15/10/22.
//  Copyright © 2015年 TORNEY_ZHANG. All rights reserved.
//

#import "AppUtil.h"
#import "LFCGzipUtility.h"
#import "PywCipherUtils.h"

@implementation AppUtil

+ (long)getNowTimeStamp{
    long time;
    NSDate *fromdate = [NSDate date];
    time = (long)[fromdate timeIntervalSince1970];
    return time;
}

+ (BOOL)timeUp:(long)targetTimeStamp differentTimeStamp:(long)differentTimeStamp{
    long nowTime = [self getNowTimeStamp];
    BOOL dialog = (nowTime - targetTimeStamp) >= differentTimeStamp ? YES : NO;
    return dialog;
}

+(NSData*)encode:(NSData*) data
{
    NSData *encrypData = [LFCGzipUtility gzipData:data];
    
//    Byte *p = (Byte*)[encrypData bytes];
    
    long length = [encrypData length];
    Byte *tmpBuf = (Byte*)[encrypData bytes];
    Byte *result = (Byte*)malloc(length);
    for (long i = 0, j = 0, k = length -1; i<length;) {
        result[j++] = tmpBuf[i++];
        if (i == length)
            break;
        result[k--] = tmpBuf[i++];
    }
    
    NSData *resultData = [NSData dataWithBytes:result length:length];
    
    return resultData;
}

+(NSData*)decode:(NSData*) data
{
    long length = [data length];
    
    Byte *tmpBuf = (Byte*)[data bytes];
   
    Byte *result = (Byte*)malloc(length);
    for (long i = 0, j = length - 1, k = 0;; i++, j--) {
        if (i == j) {
            result[k] = tmpBuf[i];
            break;
        }else if (i>j){
            break;
        }
        result[k++] = tmpBuf[i];
        result[k++] = tmpBuf[j];
    }
    
    NSData *resultData = [NSData dataWithBytes:result length:length];
    NSData *declipherData = [LFCGzipUtility uncompressZippedData:resultData];
    return declipherData;
}

/**
 *   应返回NSString 需要对tid apisecret做CRC32处理
 *
 *  @param tid       tid
 *  @param apiSecret 初始化成功返回的参数
 */
+(NSString *)getApiSecret2:(NSString *) tid apiSecret:(NSString *) apiSecret
{
//    PLog(@"\n****************渠道字符原值****************\ntid = %@\n    apiSecret = %@\n",tid,apiSecret);
    const char *instr = [tid UTF8String];
    unsigned int crc32_value = [AppUtil getCRC32Value:instr len:tid.length];
    unsigned int len = (unsigned int)(crc32_value % apiSecret.length);
    
    if(len == 0) {
        len = 1;
    }

//    PLog(@"\n****************渠道字符截取****************\ninstr = %s\n   tid = %@\n    apiSecret = %@\n  crc32_value = %d\n    len = %d\n",instr,tid,apiSecret,crc32_value,len);
    NSString *str1 = [apiSecret substringFromIndex:len];
    NSString *str2 = [apiSecret substringToIndex:len];
    
    NSString *str = [str1 stringByAppendingFormat:@"%@%@", tid, str2];
    
    return [PywCipherUtils md5:str];
    
}

+ (unsigned int)getCRC32Value:(const char*)inStr len:(unsigned long)len
{
    return [AppUtil getCrc32:inStr len:len];
}

+ (unsigned int) getCrc32:(unsigned char*) inStr len:(unsigned long) len
{
    //生成Crc32的查询表 3409808112
//    unsigned int i,j;
    unsigned int crc;
//    unsigned int crc32Table[256];
////
//    for (i = 0; i < 256; i++) {
//        crc = i;
//        for (j = 0; j < 8; j++) {
//            if (crc & 1) {
//                crc = (crc >> 1) ^ 0xEDB88320;
//            } else {
//                crc >>= 1;
//            }
//        }
//        crc32Table[i] = crc;
//    }
    
    
    //计算CRC32校验值
    unsigned char *end;
    
    crc = 0;
    
    crc = ~crc;
    for(end = inStr + len; inStr < end; ++inStr) {
        crc = crc32Table[(crc ^ * inStr) & 0xff] ^ (crc >> 8);
    }
    return ~crc;

//    for(int i=0; i<len; i++) {
//        crc = (crc >> 8) ^ crc32Table[(crc ^ inStr[i]) & 0xff];
//    }
//    
//    crc = ~crc;
//    return crc;
}

unsigned int crc32Table[256] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
    0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
    0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
    0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
    0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
    0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
    0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
    0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
    0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
    0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
    0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
    0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
    0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
    0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
    0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
    0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
    0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
    0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
    0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
    0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
    0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
    0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
    0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
    0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
    0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
    0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
    0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
    0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
    0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
    0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
    0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
    0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
    0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
    0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
    0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
    0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
    0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
    0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
    0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
    0x2d02ef8d
};
@end
